/**
 * Copyright (c) 2006-2015, JGraph Ltd
 * Copyright (c) 2006-2015, Gaudenz Alder
 */
/**
 * Class: mxCellState
 *
 * Represents the current state of a cell in a given <mxGraphView>.
 *
 * For edges, the edge label position is stored in <absoluteOffset>.
 *
 * The size for oversize labels can be retrieved using the boundingBox property
 * of the <text> field as shown below.
 *
 * (code)
 * var bbox = (state.text != null) ? state.text.boundingBox : null;
 * (end)
 *
 * Constructor: mxCellState
 *
 * Constructs a new object that represents the current state of the given
 * cell in the specified view.
 *
 * Parameters:
 *
 * view - <mxGraphView> that contains the state.
 * cell - <mxCell> that this state represents.
 * style - Array of key, value pairs that constitute the style.
 */
function mxCellState (view, cell, style) {
  this.view = view
  this.cell = cell
  this.style = (style != null) ? style : {}

  this.origin = new mxPoint()
  this.absoluteOffset = new mxPoint()
};

/**
 * Extends mxRectangle.
 */
mxCellState.prototype = new mxRectangle()
mxCellState.prototype.constructor = mxCellState

/**
 * Variable: view
 *
 * Reference to the enclosing <mxGraphView>.
 */
mxCellState.prototype.view = null

/**
 * Variable: cell
 *
 * Reference to the <mxCell> that is represented by this state.
 */
mxCellState.prototype.cell = null

/**
 * Variable: style
 *
 * Contains an array of key, value pairs that represent the style of the
 * cell.
 */
mxCellState.prototype.style = null

/**
 * Variable: invalidStyle
 *
 * Specifies if the style is invalid. Default is false.
 */
mxCellState.prototype.invalidStyle = false

/**
 * Variable: invalid
 *
 * Specifies if the state is invalid. Default is true.
 */
mxCellState.prototype.invalid = true

/**
 * Variable: origin
 *
 * <mxPoint> that holds the origin for all child cells. Default is a new
 * empty <mxPoint>.
 */
mxCellState.prototype.origin = null

/**
 * Variable: absolutePoints
 *
 * Holds an array of <mxPoints> that represent the absolute points of an
 * edge.
 */
mxCellState.prototype.absolutePoints = null

/**
 * Variable: absoluteOffset
 *
 * <mxPoint> that holds the absolute offset. For edges, this is the
 * absolute coordinates of the label position. For vertices, this is the
 * offset of the label relative to the top, left corner of the vertex.
 */
mxCellState.prototype.absoluteOffset = null

/**
 * Variable: visibleSourceState
 *
 * Caches the visible source terminal state.
 */
mxCellState.prototype.visibleSourceState = null

/**
 * Variable: visibleTargetState
 *
 * Caches the visible target terminal state.
 */
mxCellState.prototype.visibleTargetState = null

/**
 * Variable: terminalDistance
 *
 * Caches the distance between the end points for an edge.
 */
mxCellState.prototype.terminalDistance = 0

/**
 * Variable: length
 *
 * Caches the length of an edge.
 */
mxCellState.prototype.length = 0

/**
 * Variable: segments
 *
 * Array of numbers that represent the cached length of each segment of the
 * edge.
 */
mxCellState.prototype.segments = null

/**
 * Variable: shape
 *
 * Holds the <mxShape> that represents the cell graphically.
 */
mxCellState.prototype.shape = null

/**
 * Variable: text
 *
 * Holds the <mxText> that represents the label of the cell. Thi smay be
 * null if the cell has no label.
 */
mxCellState.prototype.text = null

/**
 * Variable: unscaledWidth
 *
 * Holds the unscaled width of the state.
 */
mxCellState.prototype.unscaledWidth = null

/**
 * Variable: unscaledHeight
 *
 * Holds the unscaled height of the state.
 */
mxCellState.prototype.unscaledHeight = null

/**
 * Function: getPerimeterBounds
 *
 * Returns the <mxRectangle> that should be used as the perimeter of the
 * cell.
 *
 * Parameters:
 *
 * border - Optional border to be added around the perimeter bounds.
 * bounds - Optional <mxRectangle> to be used as the initial bounds.
 */
mxCellState.prototype.getPerimeterBounds = function (border, bounds) {
  border = border || 0
  bounds = (bounds != null) ? bounds : new mxRectangle(this.x, this.y, this.width, this.height)

  if (this.shape != null && this.shape.stencil != null && this.shape.stencil.aspect == 'fixed') {
    var aspect = this.shape.stencil.computeAspect(this.style, bounds.x, bounds.y, bounds.width, bounds.height)

    bounds.x = aspect.x
    bounds.y = aspect.y
    bounds.width = this.shape.stencil.w0 * aspect.width
    bounds.height = this.shape.stencil.h0 * aspect.height
  }

  if (border != 0) {
    bounds.grow(border)
  }

  return bounds
}

/**
 * Function: setAbsoluteTerminalPoint
 *
 * Sets the first or last point in <absolutePoints> depending on isSource.
 *
 * Parameters:
 *
 * point - <mxPoint> that represents the terminal point.
 * isSource - Boolean that specifies if the first or last point should
 * be assigned.
 */
mxCellState.prototype.setAbsoluteTerminalPoint = function (point, isSource) {
  if (isSource) {
    if (this.absolutePoints == null) {
      this.absolutePoints = []
    }

    if (this.absolutePoints.length == 0) {
      this.absolutePoints.push(point)
    } else {
      this.absolutePoints[0] = point
    }
  } else {
    if (this.absolutePoints == null) {
      this.absolutePoints = []
      this.absolutePoints.push(null)
      this.absolutePoints.push(point)
    } else if (this.absolutePoints.length == 1) {
      this.absolutePoints.push(point)
    } else {
      this.absolutePoints[this.absolutePoints.length - 1] = point
    }
  }
}

/**
 * Function: setCursor
 *
 * Sets the given cursor on the shape and text shape.
 */
mxCellState.prototype.setCursor = function (cursor) {
  if (this.shape != null) {
    this.shape.setCursor(cursor)
  }

  if (this.text != null) {
    this.text.setCursor(cursor)
  }
}

/**
 * Function: getVisibleTerminal
 *
 * Returns the visible source or target terminal cell.
 *
 * Parameters:
 *
 * source - Boolean that specifies if the source or target cell should be
 * returned.
 */
mxCellState.prototype.getVisibleTerminal = function (source) {
  var tmp = this.getVisibleTerminalState(source)

  return (tmp != null) ? tmp.cell : null
}

/**
 * Function: getVisibleTerminalState
 *
 * Returns the visible source or target terminal state.
 *
 * Parameters:
 *
 * source - Boolean that specifies if the source or target state should be
 * returned.
 */
mxCellState.prototype.getVisibleTerminalState = function (source) {
  return (source) ? this.visibleSourceState : this.visibleTargetState
}

/**
 * Function: setVisibleTerminalState
 *
 * Sets the visible source or target terminal state.
 *
 * Parameters:
 *
 * terminalState - <mxCellState> that represents the terminal.
 * source - Boolean that specifies if the source or target state should be set.
 */
mxCellState.prototype.setVisibleTerminalState = function (terminalState, source) {
  if (source) {
    this.visibleSourceState = terminalState
  } else {
    this.visibleTargetState = terminalState
  }
}

/**
 * Function: getCellBounds
 *
 * Returns the unscaled, untranslated bounds.
 */
mxCellState.prototype.getCellBounds = function () {
  return this.cellBounds
}

/**
 * Function: getPaintBounds
 *
 * Returns the unscaled, untranslated paint bounds. This is the same as
 * <getCellBounds> but with a 90 degree rotation if the shape's
 * isPaintBoundsInverted returns true.
 */
mxCellState.prototype.getPaintBounds = function () {
  return this.paintBounds
}

/**
 * Function: updateCachedBounds
 *
 * Updates the cellBounds and paintBounds.
 */
mxCellState.prototype.updateCachedBounds = function () {
  var tr = this.view.translate
  var s = this.view.scale
  this.cellBounds = new mxRectangle(this.x / s - tr.x, this.y / s - tr.y, this.width / s, this.height / s)
  this.paintBounds = mxRectangle.fromRectangle(this.cellBounds)

  if (this.shape != null && this.shape.isPaintBoundsInverted()) {
    this.paintBounds.rotate90()
  }
}

/**
 * Destructor: setState
 *
 * Copies all fields from the given state to this state.
 */
mxCellState.prototype.setState = function (state) {
  this.view = state.view
  this.cell = state.cell
  this.style = state.style
  this.absolutePoints = state.absolutePoints
  this.origin = state.origin
  this.absoluteOffset = state.absoluteOffset
  this.boundingBox = state.boundingBox
  this.terminalDistance = state.terminalDistance
  this.segments = state.segments
  this.length = state.length
  this.x = state.x
  this.y = state.y
  this.width = state.width
  this.height = state.height
  this.unscaledWidth = state.unscaledWidth
  this.unscaledHeight = state.unscaledHeight
}

/**
 * Function: clone
 *
 * Returns a clone of this <mxPoint>.
 */
mxCellState.prototype.clone = function () {
 	var clone = new mxCellState(this.view, this.cell, this.style)

  // Clones the absolute points
  if (this.absolutePoints != null) {
    clone.absolutePoints = []

    for (var i = 0; i < this.absolutePoints.length; i++) {
      clone.absolutePoints[i] = this.absolutePoints[i].clone()
    }
  }

  if (this.origin != null) {
    clone.origin = this.origin.clone()
  }

  if (this.absoluteOffset != null) {
    clone.absoluteOffset = this.absoluteOffset.clone()
  }

  if (this.boundingBox != null) {
    clone.boundingBox = this.boundingBox.clone()
  }

  clone.terminalDistance = this.terminalDistance
  clone.segments = this.segments
  clone.length = this.length
  clone.x = this.x
  clone.y = this.y
  clone.width = this.width
  clone.height = this.height
  clone.unscaledWidth = this.unscaledWidth
  clone.unscaledHeight = this.unscaledHeight

  return clone
}

/**
 * Destructor: destroy
 *
 * Destroys the state and all associated resources.
 */
mxCellState.prototype.destroy = function () {
  this.view.graph.cellRenderer.destroy(this)
}
